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I rented a car for one week using a company on line. I picked up the car in Italy but when I showed the documents I had printed they told me that the insurance I had purchased was not valid. I was asked to pay an extra €170 for the insurance plus € 100 for petrol for one week. It was early in the morning and I was tired so I agreed. I gave them my credit card and although they asked me to sign I forgot to do so and they didn't realise that I hadn't. As far as I know the insurance that I bought on line was valid. They did provide me with an invoice for the above amount